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EVERFLEX SILICONE 335 CONSTRUCTION is a low modulus, reactive curing silicone sealant that cures quickly to reduce dirt pick up.  It remains permanently flexible, forming a weather tight rubber-like seal.  Silicone 335 meets ISO11600 F and G 20LM



  • Faster curing than conventional low mod sealants.
  • Extremely low dirt pick up.
  • Flexible - movement accommodation of +/- 20%.
  • Waterproof seal  
  • Contains a powerful anti-fungal compound to prevent mould growth.
  • Certified under the harmonized European standard EN15651 for façade, glazing, cold climate and sanitary applications in compliance with the Construction Product Regulation


Areas For Use

  • Sealing around PVCu profile, trim and cladding.
  • Perimeter pointing to PVCu, timber and metal window and door frames.*
  • Weathersealing to pre-formed panels and formwork.                             
  • Glass to glass and glass to aluminium weathersealing.
  • Cap glazing and remedial glazing sealing.
  • General draughtproofing..


Surface Preparation

All surfaces must be clean, dry and dust free.  All loose or flaking surface coatings, and old sealant and mastic joints, should be removed before application.  Glass, metal and aluminium should be cleaned with a proprietary solvent cleaner prior to application for optimum adhesion.  Porous surfaces may require priming - a small area should be tested first.



The surfaces to be must be clean, dry and free from dust, grease and other contaminants.

Improve adhesion by wiping surface with EVERFLEX PVC SOLVENT CLEANER (pvc) EVERFLEX GLASS CLEANER (glass) or white spirits (painted surfaces). Priming is generally not required, although we always advise testing small areas prior to use.


Joint design should be as follows:

Minimum width: 6mm. Movement capacity will be impaired if the depth of the joint is greater than the width. For maximum movement accommodation, it is recommended that:

1.    The joint depth should be no less than 5mm

2.    Joint depth should be 5mm for joints up to 10mm wide

3.    Joints above 10mm in width should be half the width in depth up to 20mm and  minimum 10mm for wider joints


For deep joints, reduce depth by using EVERFLEX FIX AND FILL FOAM or a suitable joint backer rod.

All joints should be designed so that the seal is placed in a position which does not retain water or form a water trap.  Triangular fillets should be no less than 12mm across the face and should be finished with a flat or convex face. 


Cut the tip of the cartridge taking care not to damage the thread. Apply nozzle and cut at an angle of 45o with an opening slightly larger than the gap to be sealed. Apply using a standard sealant gun. Best results will be obtained by keeping an even pressure on the trigger and keeping the gun at a constant angle to the surface being sealed. To ensure a proper bond, always smooth the sealant down with a spatula or piece of wood wetted with linseed oil or white spirits. An improved joint appearance can be achieved by placing masking tape to both sides of the joint, removing within 5 minutes of application


Specific Data



Specific Gravity

~ 1 g/cm³

Application Rate

250 g/minute (3.2mm orifice 6.3 bar pressure)


<2 mm ISO  7390

Tooling Time

10 mins

Tack Free Time

30 mins

Shore A Hardness

15 (ASTM D2240)

Tensile Strength

1.5 Mpa  ASTM D412 (die C)

Tensile Modulus @ 100% Elongation

0.25 Mpas  ASTM D412 (die C)

Elongation at break

600% ASTM D412 (die C)

Tensile Adhesion Modulus At 100% Elongation

0.38 MPa  ISO 8339 (glass substrates)

Tensile Adhesion Strength At Break

0.55 Mpas  ISO 8339 (glass substrates)

Tensile Elongation At Break

200 %  ISO 8339 (glass substrates)

Peel Adhesion Strength

6 KN/m ASTM C 794

Volume Shrinkage

8% ISO 10563

Temperature Resistance

-40 to + 150°C



Health & Safety

Consult MSDS for full list of hazards



Store in cool dry conditions between + 5’C and 25’C.

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